clunk/thump sounds after spl bushings installed

nismo13807

i have a question/problem for all the members that has all these spl parts installed on their car..

-spl front lower impact bushing
-spl front lower arm bushing
-spl solid rear diff bushings
-spl rear subframe bushings
-spl FKS rear knuckle monoball bushing set

so i have all these spl bushings installed recently.. and now i have this clunking/thump sound from the rear section.. i never heard these sound before the install.. and yes i know to expect tons of vibrations, squeaking, whining, more chatter from the clutch, etc...but i dont think this is normal..

the clucking/thumping sound happens when i engage the clutch AND release it (usually 1st and 2nd gear.. sometimes 3rd)... it also happens and sounds much louder and rapidly during wheel hop in the rain (i did it on purpose in a empty parking lot to see if that will trigger the clunking/thumping sound ) .. again.. all these sounds comes from the rear section of the car.. and u can feel it when its makes the sound..

dont know if this helps but for the spl sub frame bushing.. i told my mechanic that i want it to be oem spec which on the instruction, it listed 1 big and 1 small shim for the front and no shims for the rear...
but my mechanic told me that they tried that but without the extra shim in the rear.. the subframe will not have contact with the chassie and will leave a gap..
i dont think the sound is caused by the control arm and knuckle bushings..

any help will be appreciated.. i am putting my car on the lift tomorrow to see if everything was tightened up.. and maybe even change the trans and diff fluid..